If Jimmie Johnson and his No. 48 Hendrick Motorsports team are the Muhammad Ali of NASCAR — the heavyweight that wins with both sheer power and poise — Brad Keselowski and his No. 2 Penske Racing bunch are the sport’s Sugar Ray Leonard. Not necessarily graced with the resources enjoyed by Johnson, Keselowski wins with smarts and guile — and a sweeping uppercut that comes, seemingly, from nowhere.